Chain pipe wrench



A. B. CARLL.

CHAIN MPE WRENCH. APPLICATION FILED MAY 18 |921- Pamed Mar. 28, 1922.

'nimm' nu m STATES PAI-rim eDFricEQ;

n nnrson n, oAnLL, oF NEW YORK, N; Y( l CHAIN meeneem? y Tof/,ZZ flo/om t may concern:

' this character by means of which ,pipes may beV turned in either direction. without reversing the wrench, and in which the same lirin grip upon the` pipe is obtained in either case, the wrench being. applied tor said pipe in what may be termed an intermediate posi'- tion, whether it be desired to `turn it Lin one direction or in the other, after which, by a `simple longitudinal movement of the 'wrench transversely ofthe pipe, it may be caused ,to engage the latter forturning in the desired direction. y

Another object is to provide a chain rpipe l wrench so formed and proportioned as to insure a powei'iiulgripping action upon the pipe when `the `operating handle of the ywrench is turned in either direction, the entire leverage oi the handle plusithe engaging head beingutilized to turn the pipe, while the tendency to rock the engaging head whilel the handle or `lever is under strain, only results in binding the chain in tighter `engagement `with the pipe, thuspreventing any' accidental slipping of the chain around the pipe. i i

A further object is to provide a wrench having a permanently attached chain which, after the Vengaging head is applied to `the pipe, may be easily passed around thev latter and quickly attached in operative position, whether the pipe be oi' maximum or minimum size,` the ready adjustability `of the chain aiding in easily detaching the wrench when the operation is completed. f

Si still further object is to providey a chain Apipe wrench which may be readily used to screw. or unscrew fittings of various kinds, as well as short nipples "and elbows, in which, generally, there is little exposed suriiace upon which an ordinary wrench lmay means for "engagement wrench n l Specification of Lttersjrlfatent. Y patented 'Marjgs 1922. y y pplication algdvnayi-s, i

1921;" seriaigno. 470,718;

he applied, the device of 2the present inven-` tionv being relatively narrowfand 'having with such fittings and being otsimple,

pable of manufacture and sale at a lowcost.

1" A full and complete understanding of the 'invention may fbe obtained `froma considera- A-tionof the following q detailed description, taken in l:connection withthe accompanying drawing forminga part of this' Specifica!` tion, it being understood that wli'ilethe ld-rawing shows a practical form of the-in-` Iventionthelatter is4 not confined tostrict conformlty therewith, but may be `changed though rugged, `construction, composed `of few parts and ca-y or modified, so long as such changes or modivcations mark no material departure. from the -salient features of ttheinvent-ion as specically pointed out inthe appended claims.

in the drawing, in which' similarfreference characters vdesignate parts throughout the several figures: Fig. lis aside elevation oftheimproved Vthe operating handley being .partly brokenv off .and showing, in full lines, vthe position of the pipe and chain for turning in one direction, andiin dotted lines orrturning in the opposite direction. 1 i i Fig..V 2 is a planl view oi the same. Figx is a ydetail longitudinal section of .the wrenchhead and removable/shoe.

Fig. 4 yis a bottomxplan viewof the .removable shoe. i l' Fig. 5 is a detail longitudinal sectional view of a slightly modiiied orm'of removable or reversible'shoe, the wrench head being shown in dottedlines. f

A substantially triangular-shaped head l, preferably formed oi forged steel, is provided, said .head being relatively `long'as compared to its thickness, the top rcomprising two inclined surfaces 2 rising to anapex located at the `center oi' the head, thus giving the head the greatest thickness atthe center thereof` where the greatest strengthis required to withstand the strain to which the head `is subjected during they corresponding y Kthe head of the drawing, and

, e at the ends where the inclined upper faces 2 approach the straight underside d of the head, the latter is symmetrically curved lintegrally with the head 1 Y Y longitudinal axis arranged substantially as at 5 and 6 respectively to provide what may be termed the heel, and the toe of the` head block.

An operating handle 7 preferablyorined and having its parallely to and above the straighthori'zontal bottom tace L1 of the ,head,is. joinedto l`fthe inclined upper face '2. ff the head, which.

.thejwidth .of the A head,

LovalV shape ,in cross sectionto Jfacilitate the ,grasping ofthe `the Y inclined portion .extendsbetween the apex.-

3 and theheel 5, .byaninclined portion 18. .Y y Y. y

l :The handle 7 is preferably narrowerthan `andis rounded or oi' handle by the operator, and S, where connected. to

thethead, extends nearly the full length of theladj'acentfupper inclined face 2, the outer i'ace or' theV inclined jprtion 8V merging with the. apex 13, Y

`Extending outwardly v:from thefhe'vel 5 and joinedto the lower face of the operating handle,1atgrthefinclined portion 8 thereof, is airintegral ear 9, located at the longitudinal Vcenter-'oit the handle and therhead, and pro- VLvidedwith a suitableaperture for; the reception of a rivetY i terminalpair of links' oi' achainill perma o'r pin 10, which connects ythe -nently thereto i and permits the latterV to jtr'eely swing on the same. v

A The chain 11 comprises. a plurality of links oii ordinary construction,` arranged inl pairs,

' joined'together by rivets, having theirfends extended beyond the outer faces of the outside links to provide oppositely disposed studs 1Q, any pair of which is adapted to be engaged withvand held byv-a pair olif spaced, rearwardly-directed hooksl, ifori'nedat the upper endsof spaced upwardly-extending lugs 14'cast integrally with thehead, and

having their sidewalls flush with the side walls of the head. The upper walls of the Y lugs 111 are Yhorizontallydisposed and extend from the'apex 3 to the Vseat orn the hooks 13, and provide for freely sliding thestuds 12 of 'the chain into their seated positionfasvwill bereadilyunderstood. The space between the lugs 14 is sufficient to freely vpermit the placing ofthe outermost links ofthe chain between the same, 'and theY forward edges 'of said lugs are so Jformedr as to allow the adjacent links or' the chain to rest upon the forward inclinedl face 2 extending from the apex' to the toe end 6 of the head.

' VVThe several links of the chain are so Vproportioned and shaped as totit snugly around the rounded toe end 6 ofthe head, no mat ter which pair'of studs 12 maybe engaged with the spaced hooks. 13, when the wrench is in the applied position indicated in dotted lines vin Fig.' 1,'and it will also beA seen that the terminal pair of links of the chain,

12 shows what may Vwhere connected to the ear 9, are also adapt- 'ed to snuglyrit around the heelend 5 of the head, when 'the wrench, is inthe :applied position indicated in full lines in saidiigure.

The lowerl face i of the Y p Y head 1 is provided with a transversely disposed groove 15 ex tending entirely across the sam'e, and is turtherprovided with a centrally'4 disposed threaded aperture 16 extending ypar-t way throughf'tlhe head in adirection toward the apex` j, K The side walls of the groove or recess 15 are somewhat: tapered Lto correspond with the v`side edges of a centrally disposed boss 17,:torn'1edV integrally with a removable shoe 18,- the latter/,being V(io-.extensive with the '-length ofthe headv and adapted to it against 1 the bottom -fa'ce of the same, 'with the boss 16 iitting within the groove 15, and held in its engagement therewith bya suitablescrew ,19 havingits head countersunk in a transverse,- cen'trally, located recess 20 formedin face of `the head by means the transverse boss 17 of the recess 2O to the dis-posed teeth 21 are Jformed in said curved walls and in opposite relation to each other to provide' arcuate oppositely-disposed pipe for .engaging the pipe'to prevent slipping ofA the -wrench thereon. 'Y InsteadY of a removable shoe, the pipe gripping teeth could be cut in; theunderside of the head. i The fnllline position illustrated in Fig. be called the toe bite or `holdv of the wrench, which position is assumed bythe wrench when turningthe pipe Vin one direction,`as for unsc'rewing the saine igoni threaded connection with another menier. v l Y.

Ygripping surfaces `be turned and tor l The dotted line position osaid gure'inlli VVdicates what may be termed the heel bite or hold of the wrench, and indicates the position assumedby the wrench when turning the pipe inthel opposite direction, as vto screw the same into engagement.

The headoic the wrenchis placed centrally upon the pipe or against` the same,` as the caseiiiav be, with the recess 2O litting the sannejwhenthe chain is drawn aroiind the ypipe and the proper link connected with the hooks 14.' By drawingr the head to one side 'to engagefthe teeth 21 at the toe end of the 4shoe with pressure on the Vhandle 7,;the chain will be the pipe and exerting an upward caused to bindagainst' the p-ipe vwith: a powerful grip. By manipulating-the head and the chain in, the opposite manner, the teeth at the heel end will suiiice to bind the chain for turning the pipe in the opposite direction. The head and *shoe which together forms the jaw for the i'v'rench, acts as an elliptical cani in tightening the chain, whichever way the Wrench is turned. It will be observed from Fig. l that the handle is offset from the head and shoe so as to give free use of the heel of the wrench upon the pipe.

In Figure 5 a reversible shoe 22 is shown, having teeth 23 on both faces thereof, and a central threaded aperture 24 for the reception of a fastening screw. In this form, the head is provided with atoothed seat for the reception of that set of teeth not in use, and the head of the screw is seated in a countersunlr seat in said head, and when one set of teeth becomes materially worn, it is only necessary to loosen the screw and reverse the shoe to present a new set of teeth for use.

From the foregoing description it will be seen that a simple, cheaply manufactured Wrench has been provided, consisting of few parts, so formed and associated, aseto produce a powerful gripping action upon the pipe or other object to be turned.

lVhat is claimed is l. In a chain pipe wrench, the combination of a head having curved oppositelydisposed pipe gripping faces on its underside extending from substantially the center thereof lengthwise toward each end, the rounded ends of the said gripping faces merging With the rounded ends of said head so as to provide symmetrical chain-bearing ends, a handle at one end of the head rising from that face of the head remote from the gripping face and offset from the adjacent chain bearing end, a chain, means for pivot-v ally attaching one end of said chain 'to the underside of the handle above the chainbearing end, and means for attaching the other end of said chain to the upper or outer side lof the head above the other chain-bearing end, whereby the head acts as an elliptical Cam causing the chain to wrap around either end of the head and the chain swing-` ing clear of the other end and being drawn more firmly around thepipe. y

2. In a pipe wrench, the combination of a head having rounded chain bearing ends, and curved oppositely disposed toothed pipe gripping surfaces on its under side, said toothed surfaces extending from the central part to each end and merging with the rounded chain bearing ends, a handle joined to the head at one end at a point above the chain bearing end, a chain having one end pivotally attached adjacent to but above the 'inner rounded end of the head, and means for attaching the chain to the opposite end of the head above the outer' chainbearing end, whereby the chain ivillwrap around either end of the head and at the Sametime will swing clear of the otherl end and be and its under side provided with a transverse recess inthe center, a handle joining one of the tapered upper faces and offset from the head, a shoe mounted upon the underside of the head, said shoe having oppositely disposed arcuate pipe gripping surfaces each side of its central part and rounded chain bearing ends, said central part having a recess on the under side and a shouldered rib on the upper side to engage the recess of the head, means for holding said shoe to the head, a chain pivotally attached adjacent to but above the handle end of head, and adjustable chain attaching means in relatively the same position on the opposite end of the head, whereby either end of the shoe may be used upon the pipe, the chain at one Vend swinging clear of the shoe vreaching round the pipe and being tightened by the action of the opposite end of the shoe and head againstit.

4. In a pipe wrench, comprising a head, handle and chain, a pipe gripping shoe on the underside of the head extending an equal distance from the center of the head'tovvard y each end, the underside of said shoe having pipe gripping teeth andbeing curved or arcuate cach way from the center so as to rock upon the pipe and to engage it from either end of the shoe, the handle of the wrench being so joined to the head as to give free action of either end of the shoe. a

chain having oneend fastened tothe handle end of the head and arranged to extend around each end of said shoe, and means for adjustably attaching thel other end of the chain to the opposite end of the head in the same relative position with regard to the shoe as at the fixed end, whereby vwhen either end `of the shoe is in contact with the pipe, the chain at `such end will swing clear of the shoe, while the chain at the other end will be carried away from the pipe and tightened by the cam or rocking effect ofthe shoe upon it. j Y

In a pipe wrench comprising a head, handle and chain, a pipe gripping shoe on the underside of the head extending an equal distance from the center of the head each way, both ends of said shoe being rounded symmetrically with pipe gripping teeth on the underside,` the upper side ofY said shoe having a transverse j boss with shoulders fitting within a recess on the underside of` end of the head and extending around said as my own, I havehereto axed my signasillloe, and ineans for adjlstzbly attaoling th ture in the presence of rtwo Witnesses. c `ain tot e opposite en o the hea n Suo Y Vmnner thateither end of the Chain Will be Y Y ADDISON B" CARLI" l `.'5 tightened bythat end o-thefshoe not in con- Witnesses: j Y tact With the pipe. Y v Y .ELsiE C. DUFF,V Intestimony, that Ifclam the foregoing v JOHN BYRNS. 

